ra
ra — 形容詞
- rapositive
- raercomparative
- raestsuperlative
1. a short form used in medical records, meaning the radial artery — the blood vess
橈動脈
橈動脈的縮寫
a short form used in medical records, meaning the radial artery — the blood vessel that travels along the inner side of the forearm and supplies blood to the hand and wrist
The surgeon checked the patient's RA before inserting the catheter.
外科醫師在插入導管前，先檢查了病人的 RA。
RA = radial artery on medical charts
Nurse Karim recorded the RA pulse at 72 beats per minute.
護理師 Karim 記錄到 RA 脈搏為每分鐘 72 下。
Blood flow through the left RA appeared normal on the ultrasound.
超音波檢查顯示左側 RA 的血流正常。
The doctor noted swelling near the RA and ordered a Doppler test.
醫師注意到 RA 附近有腫脹，於是安排了都卜勒檢查。
用法筆記
Almost always written in capital letters (RA) on medical records or surgical notes.
ra — 名詞
- rasingular
- rasplural
1. an abbreviation used in cardiology to mean the right atrium — the chamber on the
右心房
右心房的縮寫
an abbreviation used in cardiology to mean the right atrium — the chamber on the upper-right side of the heart that collects blood low in oxygen and passes it to the lower chamber below
The echocardiogram showed an enlarged RA in the elderly patient.
心臟超音波顯示這位年長病患的 RA 有擴大的情形。
RA = right atrium on cardiology reports
Blood enters the RA through the superior and inferior vena cava.
血液經由上腔靜脈和下腔靜脈進入 RA。
Dr. Yuki measured the pressure inside the RA using a thin tube.
Yuki 醫師用一根細導管測量 RA 內部的壓力。
The surgeon repaired a small tear in the wall of the RA.
外科醫師修補了 RA 壁上的一個小裂口。
用法筆記
In medical writing, RA is typically capitalised. Context (cardiology reports, surgery notes) distinguishes it from RA meaning rheumatoid arthritis.
ra — 縮寫
1. short for range — used in mathematics and statistics to mean the difference betw
範圍
全距的縮寫（統計學）
short for range — used in mathematics and statistics to mean the difference between the largest and smallest numbers in a set
The teacher asked the class to calculate the RA of the data set: 4, 9, 15, 22.
老師要求全班計算這組數據的 RA：4、9、15、22。
RA = range in statistics
An RA of 18 means the test scores vary widely from 62 to 80.
RA 為 18 表示測驗成績從 62 分到 80 分，分布範圍很廣。
Diego calculated the RA of the temperature readings for each month.
Diego 計算了每個月氣溫紀錄的 RA。
A small RA suggests the numbers are clustered close together.
RA 值很小表示這些數字彼此很接近。
The spreadsheet formula returned an RA value of 34 for the sample.
試算表公式計算出該樣本的 RA 值為 34。
用法筆記
Usually appears in textbooks, spreadsheets, or exam questions. The full word 'range' is far more common in spoken English.
2. short for regular army — the permanent, full-time professional army of a country
正規軍
正規軍的縮寫（軍事）
short for regular army — the permanent, full-time professional army of a country, as opposed to reserve or volunteer forces
Sergeant Kwame served twelve years in the RA before transferring to the reserves.
Sergeant Kwame 在 RA 服役十二年後轉入後備部隊。
RA = regular army, contrasted with reserves
RA units received new equipment before the reserve battalions.
RA 部隊在後備營之前先收到了新裝備。
Major Maeve was promoted after fifteen years of RA service.
Maeve 少校在 RA 服役十五年後獲得晉升。
The treaty limited the size of the country's RA to 50,000 soldiers.
該條約將該國的 RA 兵力限制在五萬人以內。
用法筆記
Found mostly in military documents, historical texts, and government reports. In everyday conversation, 'regular army' or 'the army' is used instead.
3. short for research assistant — a person employed to help with academic or scient
研究助理
研究助理的縮寫
short for research assistant — a person employed to help with academic or scientific research, often a graduate student
Mira worked as an RA in the chemistry lab for two semesters.
Mira 在化學實驗室擔任了兩個學期的 RA。
RA = research assistant in a lab
The professor hired three RAs to help analyse the survey data.
教授聘請了三位 RA 來協助分析問卷調查數據。
As an RA, Renata runs experiments and helps write research papers.
身為 RA，Renata 負責做實驗並協助撰寫研究論文。
The RA position paid for Ishaan's tuition and living expenses.
RA 的薪資負擔了 Ishaan 的學費和生活費。
Each RA was assigned a specific section of the literature review.
每位 RA 被分配了文獻回顧的特定章節。
用法筆記
Very common on university websites, job postings, and academic CVs. The full phrase 'research assistant' is preferred in formal writing.
4. short for residence assistant or resident assistant — a student trained to suppo
宿舍助理
宿舍助理的縮寫（大學）
short for residence assistant or resident assistant — a student trained to support and advise other students living in a university dormitory or residence hall
Stephanie applied for the RA job in her dormitory building.
Stephanie 申請了她宿舍大樓的 RA 職位。
RA = residence assistant in a dorm
The RA on duty organised a study group for first-year students.
值勤的 RA 為大一新生組織了一個讀書小組。
Each floor of the hall has an RA who lives with the students.
宿舍的每層樓都有一位 RA 與學生同住。
If you have a problem with your roommate, talk to your RA first.
如果你和室友有問題，可以先跟你的 RA 談談。
Training for new RAs covers conflict resolution and first aid.
新進 RA 的培訓內容涵蓋衝突處理和急救。
用法筆記
Primarily used on US college campuses. Some universities use the alternative abbreviation 'CA' (community assistant) or 'HA' (hall advisor).
5. short for rheumatoid arthritis — a long-term illness that causes pain, swelling,
類風濕關節炎
類風濕性關節炎的縮寫
short for rheumatoid arthritis — a long-term illness that causes pain, swelling, and stiffness in the joints because the body's immune system attacks healthy tissue
Sari was diagnosed with RA at the age of thirty-two.
Sari 在三十二歲時被診斷出患有 RA。
RA = rheumatoid arthritis diagnosis
The new medication helped reduce the swelling caused by her RA.
這種新藥有助於減輕 RA 引起的腫脹。
RA often affects the small joints of the hands and feet first.
RA 通常最先影響手部和腳部的小關節。
Eleni's RA symptoms improved after she started physical therapy.
Eleni 開始接受物理治療後，RA 的症狀有所改善。
Support groups can help people living with RA share helpful tips.
病友支持團體可以幫助 RA 患者分享有用的資訊。
用法筆記
Common in medical records, patient information leaflets, and support communities. The abbreviation is widely understood among patients and healthcare workers.
常見錯誤
6. short for right ascension — a coordinate used in astronomy to locate stars and o
赤經
赤經的縮寫（天文學）
short for right ascension — a coordinate used in astronomy to locate stars and other celestial objects, measured eastward along the celestial equator
The star's RA is 6 hours, 45 minutes, and 8 seconds.
這顆恆星的 RA 是 6 時 45 分 8 秒。
RA = right ascension coordinate
Astronomers use RA and declination together to map the night sky.
天文學家使用 RA 和赤緯來繪製夜空星圖。
Reuben adjusted the telescope to match the RA of the galaxy.
Reuben 調整望遠鏡，對準該星系的 RA。
The RA value increases as you look from west to east across the sky.
從西方往東方看天空，RA 值會逐漸增加。
A star chart lists the RA for each visible object by season.
星圖上列出每個季節可見天體的 RA。
用法筆記
Standard notation in star catalogues, telescope apps, and astronomy textbooks. Always paired with declination (dec) to form a complete sky position.
7. short for Royal Academician — a member of the Royal Academy of Arts in London, a
皇家院士
皇家藝術院院士的縮寫
short for Royal Academician — a member of the Royal Academy of Arts in London, a title given to distinguished artists
The painting was created by a well-known RA who specialises in portraits.
這幅畫是由一位擅長肖像畫的著名 RA 創作的。
RA = Royal Academician, an art title
Painter Yuki was elected an RA in 2019 and exhibited at the Summer Exhibition.
畫家 Yuki 在 2019 年當選 RA，並參加了夏季展覽。
The RA letters after an artist's name indicate membership in the Royal Academy.
藝術家姓名後面的 RA 字樣代表他是皇家藝術學院的成員。
The Royal Academy's annual show features work by both RAs and new artists.
皇家藝術學院的年度展覽同時展出 RA 和新銳藝術家的作品。
用法筆記
Typically appears after an artist's name (e.g. 'John Smith RA') or in art-historical contexts. May also refer to the Royal Academy itself.
8. short for radium — a radioactive chemical element (symbol Ra) that was once used
鐳
鐳的縮寫（化學元素）
short for radium — a radioactive chemical element (symbol Ra) that was once used in luminous paints and is now used in some medical treatments
The periodic table lists Ra as the symbol for radium.
元素週期表以 Ra 作為鐳的符號。
RA (or Ra) = radium element abbreviation
Early watches used RA in the paint to make the dials glow at night.
早期的手錶使用 RA 塗料讓錶面在夜間發光。
Marie Curie discovered RA through years of work with uranium ore.
瑪麗·居禮（Marie Curie）經過多年研究鈾礦石後發現了 RA。
RA is no longer used in consumer products because of safety concerns.
由於安全疑慮，RA 已不再用於消費產品中。
Scientists wrote the decay equation using Ra to represent radium.
科學家用 Ra 這個符號來表示鐳，書寫衰變方程式。
The symbol Ra appears on safety labels for radioactive materials.
符號 Ra 會出現在放射性物質的安全標籤上。
Compounds containing Ra can be used to treat some types of bone cancer.
含有 Ra 的化合物可用於治療某些類型的骨癌。
用法筆記
In chemistry contexts, the abbreviation is more often written as 'Ra' (capital R, lowercase a). 'RA' in all capitals typically refers to other meanings.